Floating line or rope

Abstract: A floating line or rope (1) consisting of two or more strands (3) of fibres of vegetable material or synthetic material such as hemp or nylon, and a buoyancy body/buoyancy bodies (2) arranged as a part of the rope. The floating line is manufactured by spinning according to the "laid rope" method whereby the buoyancy body/bodies (2) is/are arranged as the core of one or more strands (3), the fibres in the strand being spun around the buoyancy body/bodies.

Description: The present invention concerns a floating line or rope. The floating line or floating rope is used in fishing tackle such as fishing lines and nets or in other contexts in which there is a need for the rope as such to have buoyancy or where it is desirable for it to float on the surface of the water (surface of the sea). Prior proposals are known, in accordance with which floating lines are produced by plaiting the strands of the line around a continuous buoyancy body of expanded plastic material. Thus with this type of floating line only one buoyancy body is used and the strands or parts of the line form a "jacket" around the buoyancy body. Such plaited floating lines are expensive to produce as the mechanical production method is complicated and slow. Furthermore, it is difficult to splice the plaited floating lines and it takes a very long time because each strand or part of the end of one line must be inserted into the buoyancy body in the end of the other line. US-A-3.558.420 presents a method for producing hollow fibres by extruding a melted, synthetic polymer material through spinning nozzles, i.e. rotating nozzles which create a spun rope. The patent states that this method can be used to manufacture marine lines, ropes or nets by interweaving the hollow fibres with solid fibres of the same or different diameter. Thus, using this method, the hollow and the solid fibres are "mixed" and spun so that together they form the strands of each rope. As far as we are aware, this type of rope is not available on the market and has not, therefore, been a commercial success despite being invented as long ago as 1967. The reason for the lack of commercial success is probably the fact that a rope produced in accordance with the method in question has a low level of buoyancy and that the manufacturing method in itself is expensive. The US 411,161 discloses a floating rope consisting of braided threads forming a tube in which cylinders of cork or similar light wood are arranged as a buoyancy core. According to one embodiment, strands may be twisted around the tube composed of the braided threads and containing the cylinders in order to achieve a larger rope. With respect to an embodiment having strands twisted around a tube which consists of a flexible material and which is filled with granulated cork, the US 411,161 mentions the problem that the tension on the strands causes them to embed themselves into the granulated cork and tube and such granulated cork becomes water-soaked and looses its buoyancy. The FR-A-2 197 392 discloses a floating line or rope consisting of three or more strands of synthetic fibres, the floating line or rope being manufactured by laying the strands, wherein in each strand a buoyancy core is arranged, said buoyancy core being manufactured from a plastic material, the density of which is chosen according to the application of the floating line or rope. The fibres in the respective strand constitute a tubular envelope having a constant cross-section, said envelope encloses the corresponding buoyancy core. In accordance with the present invention, a floating line or rope has been produced which is considerably cheaper to manufacture than the above known solutions and which has improved buoyancy properties and which can be spliced more simply and more rapidly and which has a high reliability. The floating line or rope according to the invention consists of two or more strands of fibres such as vegetable fibres of hemp or Manila hemp etc. or synthetic fibres of nylon, terylene etc., the floating line or rope being manufactured by laying the strands, wherein in one or more of the strands a buoyancy core, manufactured from expanded or extruded polypropylene, polyethylene, polyester, nylon or polystyrene, is arranged, and wherein the fibres in the respective strand are laid around the buoyancy core. The speed of manufacture of such a "laid" floating line or rope is 10-15 times greater than that of a plaited line. Thus production costs will be considerably lower. Splicing a spun rope or line is also more rapid and simpler because the buoyancy body/bodies is/are provided as the buoyancy core/cores of the strands so that the rope/line can be spliced in the ordinary manner used for laid ropes. Moreover, buoyancy can easily be increased or reduced by arranging the buoyancy core/cores in one or more, and possibly all of the strands or by reducing the diameter of the buoyancy core in the respective strand. Dependent claims 2 and 3 define preferred embodiments of the present invention. The present invention will be described in more detail in the following by means of examples and with reference to the enclosed drawing, which shows a three-stranded line or rope 1, i.e. a rope with three strands. The fibres (not shown in detail) in each strand 3 are spun ("laid") around separate, but continuous buoyancy bodies 2 so that the buoyancy bodies form a protected buoyancy core in each of the strands. The strands themselves are then spun and form the "complete" floating line or floating rope. The present invention as it is defined in the claims is not restricted to the solution shown in the drawing. Thus a floating line or rope in accordance with the present invention may consist of two or more than three strands. Furthermore, just one or several of the strands can be provided with a buoyancy core. Regarding the buoyancy core/cores, it/they can be manufactured from expanded plastic material, preferably expanded polypropylene, polyetylene, polyester, nylon, polystyrene or from a hollow, air-filled or gas-filled buoyancy element, preferably extruded polypropylene, polyethylene, polyester, nylon or polystyrene. The buoyancy core can, moreover, be manufactured as a continuous "sausage" or be divided up into separate, preferably continuous buoyancy elements.

Claims: A floating line or rope (1) consisting of two or more strands (3) of fibres such as vegetable fibres of hemp or Manila hemp etc. or synthetic fibres of nylon, terylene etc., the floating line or rope (1) being manufactured by laying the strands (3), wherein in one or more of the strands (3) a buoyancy core (2), manufactured from expanded or extruded polypropylene, polyethylene, polyester, nylon or polystyrene, is arranged, and wherein the fibres in the respective strand (3) are laid around the buoyancy core (2). A floating line or rope (1) in accordance with claim 1, wherein all the strands (3) are provided with buoyancy cores (2). A floating line or rope (1) in accordance with claim 1 or 2, wherein the buoyancy core (2) in each strand (3) is continuous or divided into several, individual elements which are connected to a continuous string.

Inventors: FROYSTAD PER, FROYSTAD, PER
Applicants: FROYSTAD FISKEVEGN AS
Application year: 1994
Main classification: D07B1
IPC codes: D07B1